package train48days;

import java.math.BigInteger;
import java.util.Arrays;
import java.util.Scanner;

public class 三角形 {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in );
        while (sc.hasNext()){
            BigInteger [] arr = new BigInteger[3];
            for (int i = 0; i < 3; i++) {
                arr[i] = sc.nextBigInteger();
            }
            Arrays.sort(arr);
            if (arr[0].add(arr[1]).compareTo(arr[2])>0){
                System.out.println("Yes");
            }else {
                System.out.println("No");
            }
        }
    }
}
